Magnetostrictive electrohydraulic differential amplifier

 

(57) Abstract:

The amplifier is designed for use in electro-hydraulic actuators of different machines. The amplifier consists of a body, spool valve, differential straightforward magnetostrictive actuators, two guide sleeves of a nonmagnetic material, two distributed control windings, two permanent magnets, the two parts of the control unit and leads for connection to the lines of head, discharge, hydraulic. The technical result is an increase in accuracy, performance and reliability. 1 Il.

The invention relates to hydraulics and can be used in electro-hydraulic actuators of different machines.

Known electro-hydraulic amplifier, which contains the source (unit) control of electrical signals, the spool valve and the Electromechanical transducer, consisting of a package of bimorph piezoelectric elements in the form of a split drives installed on the surface of cylindrical shells with constant and variable throttling elements [1].

Famous electrohydraulic amplifier consisting of hydrocal and movable element of the Electromechanical transducer, the electronic key and the delay unit [2].

The main disadvantage of the known devices [1, 2] is the lack of accuracy and performance, low reliability. Their piezoelectric Electromechanical transducers have leftove kinematic coupling, which reduces the accuracy of positioning of the valve element, which tends to decrease with increasing temperature environment. Pulse mode control moving piezoelectric actuators reduces the performance of these devices. In addition, they have a rather complicated structure, especially the device [1], and piezoelectric elements are sensitive to shock loads. This reduces their reliability and accuracy.

The closest in technical essence to the invention is an electro-hydraulic amplifier, selected as a prototype, which includes a housing, a sleeve of plastic material with a distribution valve, a rod of magnetostrictive material, an electrical winding, the control unit and the transmitter [3].

The known device has poor accuracy and speed of positioning of spool valve, reducing the area of technical p is yet to reduce the impact component of the temperature error and the residual deformation in the process of change of homogeneity of the ferromagnetic environment. Magnetostrictive actuator amplifier operates in the lower part of the magnetization curve with a pronounced nonlinearity of the second order and has a non-linear output characteristic. This reduces the sensitivity of the transducer and leads to nepovtorimosti performance. The hysteresis magnetostrictive actuator does not allow us time to control the reciprocating movement of the spool valve and leads to a temporary delay in each phase of the progressive movement. The result is reduced performance of the amplifier.

The technical result of the invention is to improve the accuracy and processing speed.

This objective is achieved in that in the magnetostrictive electrohydraulic differential amplifier, comprising a housing, which has a spool dispenser, connected to the line pressure, the drain and the hydraulic motor and one end connected with a straight magnetostrictive actuating element coaxially mounted thereon a distributed control winding, the conclusions of which is connected to the control unit, inputs of the second similar m the second part of the control unit, one end of which is connected to the other side of spool valve, two guide sleeve of non-magnetic material, in which are mounted differential magnetostrictive actuators, two permanent magnet fixed to the first and second control windings, respectively.

Structural scheme of the magnetostrictive electrohydraulic differential amplifier shown in the drawing.

Magnetostrictive electrohydraulic differential amplifier includes a housing 1, the spool valve 2, the differential magnetostrictive actuators 3, 4, two guide sleeves 5, 6 of non-magnetic material, two distribution control windings 7, 8 with permanent magnets 9, 10, the control unit presents the two parts 11, 12.

The amplifier includes a housing 1, in the middle part of which is placed spool dispenser 2 having leads for connection to the lines P, T, A and B pressure discharge and the hydraulic motor, respectively, and differentially spaced rectilinear magnetostrictive actuators 3, 4, mounted in the same guide sleeves 5, 6 of nonmagnetic material is to Bolotnikova distributor 2, other fixed on the end surface of the housing 1 of the amplifier. Coaxially with him the entire length of the set of the same name distributed control windings 7, 8 with permanent magnets 9, 10 connected to the first and second parts 11, 12 of the control unit, respectively.

Magnetostrictive electrohydraulic differential amplifier operates as follows.

Before you begin amplifier (see the drawing) on the findings of the parts 11, 12 of the control unit are formed of a single-phase current signals of a given amplitude, which are received in the first and second control windings 7, 8 and create in their workspaces longitudinal electromagnetic field. Under their influence (Eph. Joule) is the elongation of the magnetostrictive actuators 3, 4 (a ferromagnetic material with positive magnetostriction+) that does not cause movement of spool valve 2, but creates a mechanical longitudinal tension, which positively affects the formation of the magnetic texture, i.e., improving the efficiency of the control elements 3, 4.

After that, the control signal from outputs of the parts 11, 12 of the control unit produces out of phase for a given control algorithm gold is providing. Differential location of magnetostrictive actuators 3, 4 relative to the spool valve 2, the conclusion of their guides in the metal shell 5, 6 enhances accuracy and performance by increasing their rigidity and vsekommentarii components of the temperature error and the error hysteresis. It promotes the growth of beneficial power amplifier. To obtain a linear characteristic of its differential magnetostrictive actuators 3, 4 podmaniczky permanent ring magnets 9, 10, respectively, to set the working point on the linear plot of the functional of the magnetization curve.

To suppress the effect of obliteration of the Electromechanical Converter (2-10) can be controlled by signals from the control unit (11, 12), the modulated high frequency.

Execution of the amplifier pseudopodial scheme improves its main technical features, cost and weight and dimensions. The latter is directly related to the applied magnetostrictive material for the manufacture of actuators 3, 4. In this regard, it is expedient to apply the composite material on the basis of the coherent field, than that of the ferromagnetic rare-earth group, such as TbFe2( = +2,5103, t =20oC), under the same conditions, but several orders of magnitude below the cost of production.

The above allows us to speak about any significant differences between the claimed device and the prototype to achieve a positive result.

Sources of information

1. A. S. N 1116229 the USSR, MKI F 15 B 3/00, BI 36-84.

2. A. S. N 1078146 the USSR, MKI F 15 3/00, BI 9-84.

3. A. S. N 1710864 the USSR, MKI F 15 3/00, BI 5-92, prototype.

Magnetostrictive electrohydraulic differential amplifier, comprising a housing, which has a spool dispenser, connected to the line pressure, the drain and the hydraulic motor and one end connected with a straight magnetostrictive actuating element coaxially mounted thereon distribution control winding, the conclusions of which is connected to the control unit, characterized in that it introduced a second similar magnetostrictive element coaxially mounted thereon control winding and connected to the leads of the second part of the control unit, one end of which is connected to the other side spool distribution is klonnie actuators, two permanent magnet fixed to the first and second control windings, respectively.

 

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